Anyone familiar with DVR Port settings?

I have 2 DVR's and my 1st one 4 cam system works perfect remote viewing on this DVR I'm using the Mobile Port , My second DVR is a 8 cam system but my
external IP is the same and I'm using the client port I got it to work on my network but it will not connect out side my network To get it to work on
my network I bumped up the port number by 1 and it worked great on my network, I think my firewall may be blocking the new port number for outside
access .

Could it be as easy as turning on port forwarding ? Also is there only 1 default mobile port # or can I bump it up to a different
number?

Without knowing anything about the DVRs themselves and only gleaning a bit about your network setup from your remarks, it's hard to know what's going
on.

Unless they are establishing a connection to a server on the Internet and you're connecting through there, it's not clear how you're able to access
the 4-port DVR from the Internet in the first place if the DVRs are sharing an IP behind NAT, unless you're already using port forwarding for the
4-port?

Without knowing more, it sounds like what you need is to have port forwarding setup for both. The ports to forward can't be the same obviously but
internally (on the devices), that shouldn't be a problem.

As an example, assume the external IP is 10.10.10.1 and the internal IPs are 192.168.1.101 and 192.168.1.102. The default port for access to the DVRs
would say, 12345.

OK got home and it works perfectly so it's got to be my firewall stopping it -

Within my network I had to change the Client port From "ie" 4 cam DVR 7777 and 8 cam DVR to 7778 in order to view both inside my network.

It seems my Firewall is blocking 7778 from outside my network .. Any advise? Again thank you.
Mobile apps I'm using 4 cam uses the mobile port and the 8 cam uses the client port so I have to use "ie"7778 otherwise it shows the 4 cam system.

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